<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="generator" content="Asciidoctor 2.0.26">
<link rel="icon" type="image/svg" href="../../../../_docs/_Assets/Logo.svg">
<title>MVVM Dialog Sample</title>
<style>
@import url(https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.1/css/all.min.css);

:root {
    --background: #fff;
    --black-color: #000;
    --background-yellow: #ff0;
    --border: #c0c0c0;
    --gray-color: #6c818f;
    --link-color-default: var(--accent-primary-color);
    --foreground-color: #222222;
    --accent-primary-color: #3578e5;
    --accent-secondary-color: #102445;
    --border2: #dddddd;
    --block-quote-color: #748590;
    --pre-background-color: #f2f2f2;
    --dark-gray-color: #333333;
    --kdb-background-color: #F7F7F7;
    --header-color: var(--accent-primary-color);
    --link-hover-color: #102445;
    --toc-border-color: #d9d9d9;
    --exampleblock-border-color: #e6e6e6;
    --em-color: #373737;
    --admotion-background-color: #e6e6e6;
    --sidebar-background-color: #e8ecef;
    --border-radius-default: 6px;
}

/* normalize.css v2.1.1 | MIT License | git.io/normalize */
/* ========================================================================== HTML5 display definitions ========================================================================== */
/** Correct `block` display not defined in IE 8/9. */
article, aside, details, figcaption, figure, footer, header, hgroup, main, nav, section, summary {
    display: block;
}

/** Correct `inline-block` display not defined in IE 8/9. */
audio, canvas, video {
    display: inline-block;
}

/** Prevent modern browsers from displaying `audio` without controls. Remove excess height in iOS 5 devices. */
audio:not([controls]) {
    display: none;
    height: 0;
}

/** Address styling not present in IE 8/9. */
[hidden] {
    display: none;
}

/* ========================================================================== Base ========================================================================== */
/** 1. Prevent system color scheme's background color being used in Firefox, IE, and Opera. 2. Prevent system color scheme's text color being used in Firefox, IE, and Opera. 3. Set default font family to sans-serif. 4. Prevent iOS text size adjust after orientation change, without disabling user zoom. */
html {
    background: var(--background); /* 1 */
    color: var(--black-color); /* 2 */
    font-family: sans-serif; /* 3 */
    -ms-text-size-adjust: 100%; /* 4 */
    -webkit-text-size-adjust: 100%; /* 4 */
}

/** Remove default margin. */
body {
    margin: 0;
}

/* ========================================================================== Links ========================================================================== */
/** Address `outline` inconsistency between Chrome and other browsers. */
a:focus {
    outline: thin dotted;
}

/** Improve readability when focused and also mouse hovered in all browsers. */
a:active, a:hover {
    outline: 0;
}

/* ========================================================================== Typography ========================================================================== */
/** Address variable `h1` font-size and margin within `section` and `article` contexts in Firefox 4+, Safari 5, and Chrome. */
h1 {
    font-size: 2em;
    margin: 0.67em 0;
}

/** Address styling not present in IE 8/9, Safari 5, and Chrome. */
abbr[title] {
    border-bottom: 1px dotted;
}

/** Address style set to `bolder` in Firefox 4+, Safari 5, and Chrome. */
b, strong {
    font-weight: bold;
}

/** Address styling not present in Safari 5 and Chrome. */
dfn {
    font-style: italic;
}

/** Address differences between Firefox and other browsers. */
hr {
    -moz-box-sizing: content-box;
    box-sizing: content-box;
    height: 0;
}

/** Address styling not present in IE 8/9. */
mark {
    background: var(--background-yellow);
    color: var(--black-color);
}

/** Correct font family set oddly in Safari 5 and Chrome. */
code, kbd, pre, samp {
    font-family: monospace, serif;
    font-size: 1em;
}

/** Improve readability of pre-formatted text in all browsers. */
pre {
    white-space: pre-wrap;
}

/** Set consistent quote types. */
q {
    quotes: "\201C" "\201D" "\2018" "\2019";
}

/** Address inconsistent and variable font size in all browsers. */
small {
    font-size: 80%;
}

/** Prevent `sub` and `sup` affecting `line-height` in all browsers. */
sub, sup {
    font-size: 75%;
    line-height: 0;
    position: relative;
    vertical-align: baseline;
}

sup {
    top: -0.5em;
}

sub {
    bottom: -0.25em;
}

/* ========================================================================== Embedded content ========================================================================== */
/** Remove border when inside `a` element in IE 8/9. */
img {
    border: 0;
}

/** Correct overflow displayed oddly in IE 9. */
svg:not(:root) {
    overflow: hidden;
}

/* ========================================================================== Figures ========================================================================== */
/** Address margin not present in IE 8/9 and Safari 5. */
figure {
    margin: 0;
}

/* ========================================================================== Forms ========================================================================== */
/** Define consistent border, margin, and padding. */
fieldset {
    border: 1px solid var(--border);
    margin: 0 2px;
    padding: 0.35em 0.625em 0.75em;
}

/** 1. Correct `color` not being inherited in IE 8/9. 2. Remove padding so people aren't caught out if they zero out fieldsets. */
legend {
    border: 0; /* 1 */
    padding: 0; /* 2 */
}

/** 1. Correct font family not being inherited in all browsers. 2. Correct font size not being inherited in all browsers. 3. Address margins set differently in Firefox 4+, Safari 5, and Chrome. */
button, input, select, textarea {
    font-family: inherit; /* 1 */
    font-size: 100%; /* 2 */
    margin: 0; /* 3 */
}

/** Address Firefox 4+ setting `line-height` on `input` using `!important` in the UA stylesheet. */
button, input {
    line-height: normal;
}

/** Address inconsistent `text-transform` inheritance for `button` and `select`. All other form control elements do not inherit `text-transform` values. Correct `button` style inheritance in Chrome, Safari 5+, and IE 8+. Correct `select` style inheritance in Firefox 4+ and Opera. */
button, select {
    text-transform: none;
}

/** 1. Avoid the WebKit bug in Android 4.0.* where (2) destroys native `audio` and `video` controls. 2. Correct inability to style clickable `input` types in iOS. 3. Improve usability and consistency of cursor style between image-type `input` and others. */
button, html input[type="button"], input[type="reset"], input[type="submit"] {
    -webkit-appearance: button; /* 2 */
    cursor: pointer; /* 3 */
}

/** Re-set default cursor for disabled elements. */
button[disabled], html input[disabled] {
    cursor: default;
}

/** 1. Address box sizing set to `content-box` in IE 8/9. 2. Remove excess padding in IE 8/9. */
input[type="checkbox"], input[type="radio"] {
    box-sizing: border-box; /* 1 */
    padding: 0; /* 2 */
}

/** 1. Address `appearance` set to `searchfield` in Safari 5 and Chrome. 2. Address `box-sizing` set to `border-box` in Safari 5 and Chrome (include `-moz` to future-proof). */
input[type="search"] {
    -webkit-appearance: textfield; /* 1 */
    -moz-box-sizing: content-box;
    -webkit-box-sizing: content-box; /* 2 */
    box-sizing: content-box;
}

/** Remove inner padding and search cancel button in Safari 5 and Chrome on OS X. */
input[type="search"]::-webkit-search-cancel-button, input[type="search"]::-webkit-search-decoration {
    -webkit-appearance: none;
}

/** Remove inner padding and border in Firefox 4+. */
button::-moz-focus-inner, input::-moz-focus-inner {
    border: 0;
    padding: 0;
}

/** 1. Remove default vertical scrollbar in IE 8/9. 2. Improve readability and alignment in all browsers. */
textarea {
    overflow: auto; /* 1 */
    vertical-align: top; /* 2 */
}

/* ========================================================================== Tables ========================================================================== */
/** Remove most spacing between table cells. */
table {
    border-collapse: collapse;
    border-spacing: 0;
}

*, *:before, *:after {
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}

html, body {
    font-size: 100%;
}

body {
    background: white;
    color: var(--foreground-color);
    padding: 0;
    margin: 0;
    font-family: "Helvetica Neue", "Helvetica", Helvetica, Arial, sans-serif;
    font-weight: normal;
    font-style: normal;
    line-height: 1;
    position: relative;
    cursor: auto;
}

a:hover {
    cursor: pointer;
}

a:focus {
    outline: none;
}

img, object, embed {
    max-width: 100%;
    height: auto;
}

object, embed {
    height: 100%;
}

img {
    -ms-interpolation-mode: bicubic;
}

#map_canvas img, #map_canvas embed, #map_canvas object, .map_canvas img, .map_canvas embed, .map_canvas object {
    max-width: none !important;
}

.left {
    float: left !important;
}

.right {
    float: right !important;
}

.text-left {
    text-align: left !important;
}

.text-right {
    text-align: right !important;
}

.text-center {
    text-align: center !important;
}

.text-justify {
    text-align: justify !important;
}

.hide {
    display: none;
}

.antialiased, body {
    -webkit-font-smoothing: antialiased;
}

img {
    display: inline-block;
    vertical-align: middle;
}

textarea {
    height: auto;
    min-height: 50px;
}

select {
    width: 100%;
}

p.lead, .paragraph.lead > p, #preamble > .sectionbody > .paragraph:first-of-type p {
    font-size: 1.21875em;
    line-height: 1.6;
}

.subheader, #content #toctitle, .admonitionblock td.content > .title, .exampleblock > .title, .imageblock > .title, .videoblock > .title, .listingblock > .title, .literalblock > .title, .openblock > .title, .paragraph > .title, .quoteblock > .title, .sidebarblock > .title, .tableblock > .title, .verseblock > .title, .dlist > .title, .olist > .title, .ulist > .title, .qlist > .title, .hdlist > .title, .tableblock > caption {
    line-height: 1.4;
    color: var(--accent-primary-color);
    font-weight: 300;
    margin-top: 0.5em;
    margin-bottom: 0.5em;
}

/* Typography resets */
div, dl, dt, dd, ul, ol, li, h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6, pre, form, p, blockquote, th, td {
    margin: 0;
    /*padding: 0;*/
    direction: ltr;
}

/* Default Link Styles */
a {
    color: var(--link-color-default);
    text-decoration: none;
    line-height: inherit;
}

a:hover, a:focus {
    color: var(--header-color);
}

a img {
    border: none;
}

/* Default paragraph styles */
p {
    font-family: inherit;
    font-weight: normal;
    font-size: 1em;
    line-height: 1.5;
    margin-bottom: 1.25em;
    text-rendering: optimizeLegibility;
}

p aside {
    font-size: 0.875em;
    line-height: 1.35;
    font-style: italic;
}

/* Default header styles */
h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6 {
    font-family: ff-meta-web-pro-1, ff-meta-web-pro-2, Arial, "Helvetica Neue", sans-serif;
    font-weight: bold;
    font-style: normal;
    color: var(--accent-primary-color);
    text-rendering: optimizeLegibility;
    margin-top: 1em;
    margin-bottom: 0.5em;
    line-height: 1.2125em;
}

h1 small, h2 small, h3 small, #toctitle small, .sidebarblock > .content > .title small, h4 small, h5 small, h6 small {
    font-size: 60%;
    color: var(--accent-secondary-color);
    line-height: 0;
}

h1 {
    font-size: 2.125em;
}

h2 {
    font-size: 1.6875em;
}

h3, #toctitle, .sidebarblock > .content > .title {
    font-size: 1.375em;
}

h4 {
    font-size: 1.125em;
}

h5 {
    font-size: 1.125em;
}

h6 {
    font-size: 1em;
}

hr {
    border: solid var(--border2);
    border-width: 1px 0 0;
    clear: both;
    margin: 1.25em 0 1.1875em;
    height: 0;
}

/* Helpful Typography Defaults */
em, i {
    font-style: italic;
    line-height: inherit;
}

strong, b {
    font-weight: bold;
    line-height: inherit;
}

small {
    font-size: 60%;
    line-height: inherit;
}

code {
    font-family: "Consolas", "Deja Vu Sans Mono", "Bitstream Vera Sans Mono", monospace;
    font-weight: normal;
    color: var(--link-color-default);
}

/* Lists */
ul, ol, dl {
    font-size: 1em;
    line-height: 1.5;
    margin-bottom: 1.25em;
    list-style-position: outside;
    font-family: inherit;
}

ul, ol {
    margin-left: 0;
}

/* Unordered Lists */
ul li ul, ul li ol {
    margin-left: 1.25em;
    margin-bottom: 0;
    font-size: 1em; /* Override nested font-size change */
}

ul.square li ul, ul.circle li ul, ul.disc li ul {
    list-style: inherit;
}

ul.square {
    list-style-type: square;
}

ul.circle {
    list-style-type: circle;
}

ul.disc {
    list-style-type: disc;
}

ul.no-bullet {
    list-style: none;
}

/* Ordered Lists */
ol li ul, ol li ol {
    margin-left: 1.25em;
    margin-bottom: 0;
}

/* Definition Lists */
dl dt {
    margin-bottom: 0.3em;
    font-weight: bold;
}

dl dd {
    margin-bottom: 0.75em;
}

/* Abbreviations */
abbr, acronym {
    text-transform: uppercase;
    font-size: 90%;
    color: black;
    border-bottom: 1px dotted var(--border2);
    cursor: help;
}

abbr {
    text-transform: none;
}

/* Blockquotes */
blockquote {
    margin: 0 0 1.25em;
    padding: 0.5625em 1.25em 0 1.1875em;
    border-left: 1px solid var(--border2);
}

blockquote cite {
    display: block;
    font-size: 0.8125em;
    color: var(--block-quote-color);
}

blockquote cite:before {
    content: "\2014 \0020";
}

blockquote cite a, blockquote cite a:visited {
    color: var(--block-quote-color);
}

blockquote, blockquote p {
    line-height: 1.5;
    color: var(--accent-secondary-color);
}

/* Microformats */
.vcard {
    display: inline-block;
    margin: 0 0 1.25em 0;
    border: 1px solid var(--border2);
    padding: 0.625em 0.75em;
}

.vcard li {
    margin: 0;
    display: block;
}

.vcard .fn {
    font-weight: bold;
    font-size: 0.9375em;
}

.vevent .summary {
    font-weight: bold;
}

.vevent abbr {
    cursor: auto;
    text-decoration: none;
    font-weight: bold;
    border: none;
    padding: 0 0.0625em;
}

@media only screen and (min-width: 768px) {
    h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6 {
        line-height: 1.4;
    }

    h1 {
        font-size: 2.75em;
    }

    h2 {
        font-size: 2.3125em;
    }

    h3, #toctitle, .sidebarblock > .content > .title {
        font-size: 1.6875em;
    }

    h4 {
        font-size: 1.4375em;
    }
}

/* Print styles.  Inlined to avoid required HTTP connection: www.phpied.com/delay-loading-your-print-css/ Credit to Paul Irish and HTML5 Boilerplate (html5boilerplate.com)
*/
.print-only {
    display: none !important;
}

@media print {
    * {
        background: transparent !important;
        color: var(--black-color) !important; /* Black prints faster: h5bp.com/s */
        box-shadow: none !important;
        text-shadow: none !important;
    }

    a, a:visited {
        text-decoration: underline;
    }

    a[href]:after {
        content: " (" attr(href) ")";
    }

    abbr[title]:after {
        content: " (" attr(title) ")";
    }

    .ir a:after, a[href^="javascript:"]:after, a[href^="#"]:after {
        content: "";
    }

    pre, blockquote {
        border: 1px solid #999;
        page-break-inside: avoid;
    }

    thead {
        display: table-header-group; /* h5bp.com/t */
    }

    tr, img {
        page-break-inside: avoid;
    }

    img {
        max-width: 100% !important;
    }

    @page {
        margin: 0.5cm;
    }

    p, h2, h3, #toctitle, .sidebarblock > .content > .title {
        orphans: 3;
        widows: 3;
    }

    h2, h3, #toctitle, .sidebarblock > .content > .title {
        page-break-after: avoid;
    }

    .hide-on-print {
        display: none !important;
    }

    .print-only {
        display: block !important;
    }

    .hide-for-print {
        display: none !important;
    }

    .show-for-print {
        display: inherit !important;
    }
}

/* Tables */
table {
    background: white;
    margin-bottom: 1.25em;
    border: solid 0 var(--border2);
}

table thead, table tfoot {
    background: none;
    font-weight: bold;
}

table thead tr th, table thead tr td, table tfoot tr th, table tfoot tr td {
    padding: 1px 8px 1px 5px;
    font-size: 1em;
    color: var(--foreground-color);
    text-align: left;
}

table tr th, table tr td {
    padding: 1px 8px 1px 5px;
    font-size: 1em;
    color: var(--foreground-color);
}

table tr.even, table tr.alt, table tr:nth-of-type(even) {
    background: none;
}

table thead tr th, table tfoot tr th, table tbody tr td, table tr td, table tfoot tr td {
    display: table-cell;
    line-height: 1.5;
}

.clearfix:before, .clearfix:after, .float-group:before, .float-group:after {
    content: " ";
    display: table;
}

.clearfix:after, .float-group:after {
    clear: both;
}

*:not(pre) > code {
    font-size: 0.95em;
    padding: 0;
    white-space: nowrap;
    background-color: var(--pre-background-color);
    border: 0 solid var(--border2);
    -webkit-border-radius: var(--border-radius-default);
    border-radius: var(--border-radius-default);
    text-shadow: none;
}

pre, pre > code {
    line-height: 1.2;
    color: inherit;
    font-family: "Consolas", "Deja Vu Sans Mono", "Bitstream Vera Sans Mono", monospace;
    font-weight: normal;
}

kbd.keyseq {
    color: var(--dark-gray-color);
}

kbd:not(.keyseq) {
    display: inline-block;
    color: black;
    font-size: 0.75em;
    line-height: 1.4;
    background-color: var(--kdb-background-color);
    border: 1px solid #ccc;
    -webkit-border-radius: 3px;
    border-radius: 3px;
    -webkit-box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2), 0 0 0 2px white inset;
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2), 0 0 0 2px white inset;
    margin: -0.15em 0.15em 0 0.15em;
    padding: 0.2em 0.6em 0.2em 0.5em;
    vertical-align: middle;
    white-space: nowrap;
}

kbd kbd:first-child {
    margin-left: 0;
}

kbd kbd:last-child {
    margin-right: 0;
}

.menuseq, .menu {
    color: black;
}

p a > code:hover {
    color: var(--link-hover-color);
}

#header, #content, #footnotes, #footer {
    width: 100%;
    margin-left: auto;
    margin-right: auto;
    margin-top: 0;
    margin-bottom: 0;
    max-width: 62.5em;
    *zoom: 1;
    position: relative;
    padding-left: 0.9375em;
    padding-right: 0.9375em;
}

#header:before, #header:after, #content:before, #content:after, #footnotes:before, #footnotes:after, #footer:before, #footer:after {
    content: " ";
    display: table;
}

#header:after, #content:after, #footnotes:after, #footer:after {
    clear: both;
}

#header {
    margin-bottom: 2.5em;
}

#header > h1 {
    color: var(--header-color);
    font-weight: bold;
    border-bottom: 1px solid var(--border2);
    margin-bottom: -28px;
    padding-bottom: 32px;
}

#header span {
    color: var(--accent-secondary-color);
}

#header #revnumber {
    text-transform: capitalize;
}

#header br {
    display: none;
}

#header br + span {
    padding-left: 3px;
}

#header br + span:before {
    content: "\2013 \0020";
}

#header br + span.author {
    padding-left: 0;
}

#header br + span.author:before {
    content: ", ";
}

#toc {
    border-bottom: 1px solid var(--border2);
    padding-bottom: 1.25em;
}

#toc > ul {
    margin-left: 0.25em;
}

#toc ul.sectlevel0 > li > a {
    font-style: italic;
}

#toc ul.sectlevel0 ul.sectlevel1 {
    margin-left: 0;
    margin-top: 0.5em;
    margin-bottom: 0.5em;
}

#toc ul {
    list-style-type: none;
}

#toctitle {
    color: var(--accent-primary-color);
}

@media only screen and (min-width: 1280px) {
    body.toc2 {
        padding-left: 20em;
    }

    #toc.toc2 {
        position: fixed;
        width: 20em;
        left: 0;
        top: 0;
        border-right: 1px solid var(--border2);
        border-bottom: 0;
        z-index: 1000;
        padding: 44px 1em 1em;
        height: 100%;
        overflow: auto;
    }

    #toc.toc2 > ul {
        padding-left: 1em;
    }

    #toc.toc2 #toctitle {
        margin-top: 0;
    }

    #toc.toc2 > ul {
        font-size: .95em;
    }

    #toc.toc2 ul ul {
        margin-left: 0;
        padding-left: 1.25em;
    }

    #toc.toc2 ul.sectlevel0 ul.sectlevel1 {
        padding-left: 0;
        margin-top: 0.5em;
        margin-bottom: 0.5em;
    }

    body.toc2.toc-right {
        padding-left: 0;
        padding-right: 20em;
    }

    body.toc2.toc-right #toc.toc2 {
        border-right: 0;
        border-left: 1px solid var(--border2);
        left: auto;
        right: 0;
    }
}

#content #toc {
    border-style: solid;
    border-width: 1px;
    border-color: var(--toc-border-color);
    margin-bottom: 1.25em;
    padding: 1.25em;
    background: var(--pre-background-color);
    border-width: 0;
    -webkit-border-radius: var(--border-radius-default);
    border-radius: var(--border-radius-default);
}

#content #toc > :first-child {
    margin-top: 0;
}

#content #toc > :last-child {
    margin-bottom: 0;
}

#content #toc a {
    color: var(--gray-color);
    text-decoration: none;
}

#content #toctitle {
    font-weight: bold;
    font-family: ff-meta-web-pro-1, ff-meta-web-pro-2, Arial, "Helvetica Neue", sans-serif;
    font-size: 1em;
    padding-left: 0.125em;
}

#footer {
    max-width: 100%;
    background-color: black;
    padding: 1.25em;
}

#footer-text {
    color: white;
    line-height: 1.35;
}

.sect1 {
    padding-bottom: 1.25em;
}

.sect1 + .sect1 {
    border-top: 1px solid var(--border2);
}

#content h1 > a.anchor, h2 > a.anchor, h3 > a.anchor, #toctitle > a.anchor, .sidebarblock > .content > .title > a.anchor, h4 > a.anchor, h5 > a.anchor, h6 > a.anchor {
    position: absolute;
    width: 1em;
    margin-left: -1em;
    display: block;
    text-decoration: none;
    visibility: hidden;
    text-align: center;
    font-weight: normal;
}

#content h1 > a.anchor:before, h2 > a.anchor:before, h3 > a.anchor:before, #toctitle > a.anchor:before, .sidebarblock > .content > .title > a.anchor:before, h4 > a.anchor:before, h5 > a.anchor:before, h6 > a.anchor:before {
    content: '\00A7';
    font-size: .85em;
    vertical-align: text-top;
    display: block;
    margin-top: 0.05em;
}

#content h1:hover > a.anchor, #content h1 > a.anchor:hover, h2:hover > a.anchor, h2 > a.anchor:hover, h3:hover > a.anchor, #toctitle:hover > a.anchor, .sidebarblock > .content > .title:hover > a.anchor, h3 > a.anchor:hover, #toctitle > a.anchor:hover, .sidebarblock > .content > .title > a.anchor:hover, h4:hover > a.anchor, h4 > a.anchor:hover, h5:hover > a.anchor, h5 > a.anchor:hover, h6:hover > a.anchor, h6 > a.anchor:hover {
    visibility: visible;
}

#content h1 > a.link, h2 > a.link, h3 > a.link, #toctitle > a.link, .sidebarblock > .content > .title > a.link, h4 > a.link, h5 > a.link, h6 > a.link {
    color: var(--accent-primary-color);
    text-decoration: none;
}

#content h1 > a.link:hover, h2 > a.link:hover, h3 > a.link:hover, #toctitle > a.link:hover, .sidebarblock > .content > .title > a.link:hover, h4 > a.link:hover, h5 > a.link:hover, h6 > a.link:hover {
    color: var(--link-hover-color);
}

.imageblock, .literalblock, .listingblock, .verseblock, .videoblock {
    margin-bottom: 1.25em;
}

.admonitionblock td.content > .title, .exampleblock > .title, .imageblock > .title, .videoblock > .title, .listingblock > .title, .literalblock > .title, .openblock > .title, .paragraph > .title, .quoteblock > .title, .sidebarblock > .title, .tableblock > .title, .verseblock > .title, .dlist > .title, .olist > .title, .ulist > .title, .qlist > .title, .hdlist > .title {
    text-align: left;
    font-weight: bold;
}

.tableblock > caption {
    text-align: left;
    font-weight: bold;
    white-space: nowrap;
    overflow: visible;
    max-width: 0;
}

table.tableblock #preamble > .sectionbody > .paragraph:first-of-type p {
    font-size: inherit;
}

.admonitionblock > table {
    border: 0;
    background: none;
    width: 100%;
}

.admonitionblock > table td.icon {
    text-align: center;
    width: 60px;
    padding: 0;
    font-size: 1.5em;
}

.admonitionblock > table td.icon img {
    max-width: none;
}

.admonitionblock > table td.icon .title {
    font-weight: bold;
    text-transform: uppercase;
}

.admonitionblock > table td.content {
    /*padding-left: 1.125em;*/
    /*padding-right: 1.25em;*/
    border-left: 1px solid var(--border2);
    color: var(--accent-secondary-color);
}

.admonitionblock > table td.content > :last-child > :last-child {
    margin-bottom: 0;
}

.exampleblock > .content {
    border-style: solid;
    border-width: 1px;
    border-color: var(--exampleblock-border-color);
    margin-bottom: 1.25em;
    padding: 1.25em;
    background: white;
    -webkit-border-radius: var(--border-radius-default);
    border-radius: var(--border-radius-default);
}

.exampleblock > .content > :first-child {
    margin-top: 0;
}

.exampleblock > .content > :last-child {
    margin-bottom: 0;
}

.exampleblock > .content h1, .exampleblock > .content h2, .exampleblock > .content h3, .exampleblock > .content #toctitle, .sidebarblock.exampleblock > .content > .title, .exampleblock > .content h4, .exampleblock > .content h5, .exampleblock > .content h6, .exampleblock > .content p {
    color: var(--dark-gray-color);
}

.exampleblock > .content h1, .exampleblock > .content h2, .exampleblock > .content h3, .exampleblock > .content #toctitle, .sidebarblock.exampleblock > .content > .title, .exampleblock > .content h4, .exampleblock > .content h5, .exampleblock > .content h6 {
    line-height: 1;
    margin-bottom: 0.625em;
}

.exampleblock > .content h1.subheader, .exampleblock > .content h2.subheader, .exampleblock > .content h3.subheader, .exampleblock > .content .subheader#toctitle, .sidebarblock.exampleblock > .content > .subheader.title, .exampleblock > .content h4.subheader, .exampleblock > .content h5.subheader, .exampleblock > .content h6.subheader {
    line-height: 1.4;
}

.exampleblock.result > .content {
    -webkit-box-shadow: 0 1px 8px var(--toc-border-color);
    box-shadow: 0 1px 8px var(--toc-border-color);
}

.sidebarblock {
    border-style: solid;
    border-width: 1px;
    border-color: var(--toc-border-color);
    margin-bottom: 1.25em;
    padding: 1.25em;
    background: var(--pre-background-color);
    -webkit-border-radius: var(--border-radius-default);
    border-radius: var(--border-radius-default);
}

.sidebarblock > :first-child {
    margin-top: 0;
}

.sidebarblock > :last-child {
    margin-bottom: 0;
}

.sidebarblock h1, .sidebarblock h2, .sidebarblock h3, .sidebarblock #toctitle, .sidebarblock > .content > .title, .sidebarblock h4, .sidebarblock h5, .sidebarblock h6, .sidebarblock p {
    color: var(--dark-gray-color);
}

.sidebarblock h1, .sidebarblock h2, .sidebarblock h3, .sidebarblock #toctitle, .sidebarblock > .content > .title, .sidebarblock h4, .sidebarblock h5, .sidebarblock h6 {
    line-height: 1;
    margin-bottom: 0.625em;
}

.sidebarblock h1.subheader, .sidebarblock h2.subheader, .sidebarblock h3.subheader, .sidebarblock .subheader#toctitle, .sidebarblock > .content > .subheader.title, .sidebarblock h4.subheader, .sidebarblock h5.subheader, .sidebarblock h6.subheader {
    line-height: 1.4;
}

.sidebarblock > .content > .title {
    color: var(--gray-color);
    margin-top: 0;
    line-height: 1.5;
}

.exampleblock > .content > :last-child > :last-child, .exampleblock > .content .olist > ol > li:last-child > :last-child, .exampleblock > .content .ulist > ul > li:last-child > :last-child, .exampleblock > .content .qlist > ol > li:last-child > :last-child, .sidebarblock > .content > :last-child > :last-child, .sidebarblock > .content .olist > ol > li:last-child > :last-child, .sidebarblock > .content .ulist > ul > li:last-child > :last-child, .sidebarblock > .content .qlist > ol > li:last-child > :last-child {
    margin-bottom: 0;
}

.literalblock > .content pre, .listingblock > .content pre {
    background: #eeeeee;
    border-width: 1px;
    border-style: solid;
    border-color: #cccccc;
    -webkit-border-radius: var(--border-radius-default);
    border-radius: var(--border-radius-default);
    padding: 0.5em;
    word-wrap: break-word;
}

.literalblock > .content pre.nowrap, .listingblock > .content pre.nowrap {
    overflow-x: auto;
    white-space: pre;
    word-wrap: normal;
}

.literalblock > .content pre > code, .listingblock > .content pre > code {
    display: block;
}

@media only screen {
    .literalblock > .content pre, .listingblock > .content pre {
        font-size: 0.76em;
    }
}

@media only screen and (min-width: 768px) {
    .literalblock > .content pre, .listingblock > .content pre {
        font-size: 0.855em;
    }
}

@media only screen and (min-width: 1280px) {
    .literalblock > .content pre, .listingblock > .content pre {
        font-size: 0.95em;
    }
}

.listingblock > .content {
    position: relative;
}

.listingblock:hover code[class*=" language-"]:before {
    text-transform: uppercase;
    font-size: 0.9em;
    color: #999;
    position: absolute;
    top: 0.375em;
    right: 0.375em;
}

.listingblock:hover code.asciidoc:before {
    content: "asciidoc";
}

.listingblock:hover code.clojure:before {
    content: "clojure";
}

.listingblock:hover code.css:before {
    content: "css";
}

.listingblock:hover code.groovy:before {
    content: "groovy";
}

.listingblock:hover code.html:before {
    content: "html";
}

.listingblock:hover code.java:before {
    content: "java";
}

.listingblock:hover code.javascript:before {
    content: "javascript";
}

.listingblock:hover code.python:before {
    content: "python";
}

.listingblock:hover code.ruby:before {
    content: "ruby";
}

.listingblock:hover code.scss:before {
    content: "scss";
}

.listingblock:hover code.xml:before {
    content: "xml";
}

.listingblock:hover code.yaml:before {
    content: "yaml";
}

.listingblock.terminal pre .command:before {
    content: attr(data-prompt);
    padding-right: 0.5em;
    color: #999;
}

.listingblock.terminal pre .command:not([data-prompt]):before {
    content: '$';
}

table.pyhltable {
    border: 0;
    margin-bottom: 0;
}

table.pyhltable td {
    vertical-align: top;
    padding-top: 0;
    padding-bottom: 0;
}

table.pyhltable td.code {
    padding-left: .75em;
    padding-right: 0;
}

.highlight.pygments .lineno, table.pyhltable td:not(.code) {
    color: #999;
    padding-left: 0;
    padding-right: .5em;
    border-right: 1px solid var(--border2);
}

.highlight.pygments .lineno {
    display: inline-block;
    margin-right: .25em;
}

table.pyhltable .linenodiv {
    background-color: transparent !important;
    padding-right: 0 !important;
}

.quoteblock {
    margin: 0 0 1.25em;
    padding: 0.5625em 1.25em 0 1.1875em;
    border-left: 1px solid var(--border2);
}

.quoteblock blockquote {
    margin: 0 0 1.25em 0;
    padding: 0 0 0.5625em 0;
    border: 0;
}

.quoteblock blockquote > .paragraph:last-child p {
    margin-bottom: 0;
}

.quoteblock .attribution {
    margin-top: -.25em;
    padding-bottom: 0.5625em;
    font-size: 0.8125em;
    color: var(--block-quote-color);
}

.quoteblock .attribution br {
    display: none;
}

.quoteblock .attribution cite {
    display: block;
    margin-bottom: 0.625em;
}

table thead th, table tfoot th {
    font-weight: bold;
}

table.tableblock.grid-all {
    border-collapse: separate;
    border-spacing: 1px;
    -webkit-border-radius: var(--border-radius-default);
    border-radius: var(--border-radius-default);
    border-top: 0 solid var(--border2);
    border-bottom: 0 solid var(--border2);
}

table.tableblock.frame-topbot, table.tableblock.frame-none {
    border-left: 0;
    border-right: 0;
}

table.tableblock.frame-sides, table.tableblock.frame-none {
    border-top: 0;
    border-bottom: 0;
}

table.tableblock td .paragraph:last-child p, table.tableblock td > p:last-child {
    margin-bottom: 0;
}

th.tableblock.halign-left, td.tableblock.halign-left {
    text-align: left;
}

th.tableblock.halign-right, td.tableblock.halign-right {
    text-align: right;
}

th.tableblock.halign-center, td.tableblock.halign-center {
    text-align: center;
}

th.tableblock.valign-top, td.tableblock.valign-top {
    vertical-align: top;
}

th.tableblock.valign-bottom, td.tableblock.valign-bottom {
    vertical-align: bottom;
}

th.tableblock.valign-middle, td.tableblock.valign-middle {
    vertical-align: middle;
}

p.tableblock.header {
    color: var(--foreground-color);
    font-weight: bold;
}

td > div.verse {
    white-space: pre;
}

ol {
    margin-left: 0.25em;
}

ul li ol {
    margin-left: 0;
}

dl dd {
    margin-left: 1.125em;
}

dl dd:last-child, dl dd:last-child > :last-child {
    margin-bottom: 0;
}

ol > li p, ul > li p, ul dd, ol dd, .olist .olist, .ulist .ulist, .ulist .olist, .olist .ulist {
    margin-bottom: 0.625em;
}

ul.unstyled, ol.unnumbered, ul.checklist, ul.none {
    list-style-type: none;
}

ul.unstyled, ol.unnumbered, ul.checklist {
    margin-left: 0.625em;
}

ul.checklist li > p:first-child > i[class^="icon-check"]:first-child, ul.checklist li > p:first-child > input[type="checkbox"]:first-child {
    margin-right: 0.25em;
}

ul.checklist li > p:first-child > input[type="checkbox"]:first-child {
    position: relative;
    top: 1px;
}

ul.inline {
    margin: 0 auto 0.625em auto;
    margin-left: -1.375em;
    margin-right: 0;
    padding: 0;
    list-style: none;
    overflow: hidden;
}

ul.inline > li {
    list-style: none;
    float: left;
    margin-left: 1.375em;
    display: block;
}

ul.inline > li > * {
    display: block;
}

.unstyled dl dt {
    font-weight: normal;
    font-style: normal;
}

ol.arabic {
    list-style-type: decimal;
}

ol.decimal {
    list-style-type: decimal-leading-zero;
}

ol.loweralpha {
    list-style-type: lower-alpha;
}

ol.upperalpha {
    list-style-type: upper-alpha;
}

ol.lowerroman {
    list-style-type: lower-roman;
}

ol.upperroman {
    list-style-type: upper-roman;
}

ol.lowergreek {
    list-style-type: lower-greek;
}

.hdlist > table, .colist > table {
    border: 0;
    background: none;
}

.hdlist > table > tbody > tr, .colist > table > tbody > tr {
    background: none;
}

td.hdlist1 {
    padding-right: .8em;
    font-weight: bold;
}

td.hdlist1, td.hdlist2 {
    vertical-align: top;
}

.literalblock + .colist, .listingblock + .colist {
    margin-top: -0.5em;
}

.colist > table tr > td:first-of-type {
    padding: 0 .8em;
    line-height: 1;
}

.colist > table tr > td:last-of-type {
    padding: 0.25em 0;
}

.qanda > ol > li > p > em:only-child {
    color: var(--em-color);
}

.thumb, .th {
    line-height: 0;
    display: inline-block;
    border: solid 4px white;
    -webkit-box-shadow: 0 0 0 1px var(--border2);
    box-shadow: 0 0 0 1px var(--border2);
}

.imageblock.left, .imageblock[style*="float: left"] {
    margin: 0.25em 0.625em 1.25em 0;
}

.imageblock.right, .imageblock[style*="float: right"] {
    margin: 0.25em 0 1.25em 0.625em;
}

.imageblock > .title {
    margin-bottom: 0;
}

.imageblock.thumb, .imageblock.th {
    border-width: var(--border-radius-default);
}

.imageblock.thumb > .title, .imageblock.th > .title {
    padding: 0 0.125em;
}

.image.left, .image.right {
    margin-top: 0.25em;
    margin-bottom: 0.25em;
    display: inline-block;
    line-height: 0;
}

.image.left {
    margin-right: 0.625em;
}

.image.right {
    margin-left: 0.625em;
}

a.image {
    text-decoration: none;
}

span.footnote, span.footnoteref {
    vertical-align: super;
    font-size: 0.875em;
}

span.footnote a, span.footnoteref a {
    text-decoration: none;
}

#footnotes {
    padding-top: 0.75em;
    padding-bottom: 0.75em;
    margin-bottom: 0.625em;
}

#footnotes hr {
    width: 20%;
    min-width: 6.25em;
    margin: -.25em 0 .75em 0;
    border-width: 1px 0 0 0;
}

#footnotes .footnote {
    padding: 0 0.375em;
    line-height: 1.3;
    font-size: 0.875em;
    margin-left: 1.2em;
    text-indent: -1.2em;
    margin-bottom: .2em;
}

#footnotes .footnote a:first-of-type {
    font-weight: bold;
    text-decoration: none;
}

#footnotes .footnote:last-of-type {
    margin-bottom: 0;
}

#content #footnotes {
    margin-top: -0.625em;
    margin-bottom: 0;
    padding: 0.75em 0;
}

.gist .file-data > table {
    border: none;
    background: var(--background);
    width: 100%;
    margin-bottom: 0;
}

.gist .file-data > table td.line-data {
    width: 99%;
}

div.unbreakable {
    page-break-inside: avoid;
}

.big {
    font-size: larger;
}

.small {
    font-size: smaller;
}

.underline {
    text-decoration: underline;
}

.overline {
    text-decoration: overline;
}

.line-through {
    text-decoration: line-through;
}

.aqua {
    color: #00bfbf;
}

.aqua-background {
    background-color: #00fafa;
}

.black {
    color: black;
}

.black-background {
    background-color: black;
}

.blue {
    color: #0000bf;
}

.blue-background {
    background-color: #0000fa;
}

.fuchsia {
    color: #bf00bf;
}

.fuchsia-background {
    background-color: #fa00fa;
}

.gray {
    color: #606060;
}

.gray-background {
    background-color: #7d7d7d;
}

.green {
    color: #006000;
}

.green-background {
    background-color: #007d00;
}

.lime {
    color: #00bf00;
}

.lime-background {
    background-color: #00fa00;
}

.maroon {
    color: #600000;
}

.maroon-background {
    background-color: #7d0000;
}

.navy {
    color: #000060;
}

.navy-background {
    background-color: #00007d;
}

.olive {
    color: #606000;
}

.olive-background {
    background-color: #7d7d00;
}

.purple {
    color: #600060;
}

.purple-background {
    background-color: #7d007d;
}

.red {
    color: #bf0000;
}

.red-background {
    background-color: #fa0000;
}

.silver {
    color: #909090;
}

.silver-background {
    background-color: #bcbcbc;
}

.teal {
    color: #006060;
}

.teal-background {
    background-color: #007d7d;
}

.white {
    color: #bfbfbf;
}

.white-background {
    background-color: #fafafa;
}

.yellow {
    color: #bfbf00;
}

.yellow-background {
    background-color: #fafa00;
}

span.icon > [class^="icon-"], span.icon > [class*=" icon-"] {
    cursor: default;
}


.admonitionblock td.icon [class^="icon-"]:before {
    font-size: 2.5em;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
    cursor: default;
}

.admonitionblock td.icon .icon-note:before {
    content: "\f05a";
    color: var(--accent-primary-color);
}

.admonitionblock td.icon .icon-tip:before {
    content: "\f0eb";
    /*text-shadow: 1px 1px 2px var(--accent-primary-color);*/
    color: var(--accent-primary-color);
}

.fa {
    font-family: "FontAwesome", "Helvetica Neue", sans-serif;
}

.admonitionblock td.icon .icon-warning:before {
    content: "\f071";
    color: #bf6900;
}

.admonitionblock td.icon .icon-caution:before {
    content: "\f06d";
    color: #bf3400;
}

.admonitionblock td.icon .icon-important:before {
    content: "\f06a";
    color: #bf0000;
}

.conum {
    display: inline-block;
    color: white !important;
    background-color: black;
    -webkit-border-radius: 100px;
    border-radius: 100px;
    text-align: center;
    width: 20px;
    height: 20px;
    font-size: 12px;
    font-weight: bold;
    line-height: 20px;
    font-family: Arial, sans-serif;
    font-style: normal;
    position: relative;
    top: -2px;
    letter-spacing: -1px;
}

.conum * {
    color: white !important;
}

.conum + b {
    display: none;
}

.conum:after {
    content: attr(data-value);
}

.conum:not([data-value]):empty {
    display: none;
}

h4 {
    color: var(--gray-color);
}

.literalblock > .content > pre, .listingblock > .content > pre {
    -webkit-border-radius: var(--border-radius-default);
    border-radius: var(--border-radius-default);
    margin-left: 0.5em;
    margin-right: 0.5em;
}

.admonitionblock {
    margin-left: .5em;
    margin-right: .5em;
}

.admonitionblock > table {
    border: 1px solid var(--accent-primary-color);
    border-left-width: 4px;
    background-color: var(--admotion-background-color);
    border-collapse: separate;
    -webkit-border-radius: var(--border-radius-default);
    border-radius: var(--border-radius-default);
}

.admonitionblock > table td.icon {
    padding-top: .5em;
    padding-bottom: .5em;
}

.admonitionblock > table td.content {
    padding: .5em .2em;
    color: black;
    font-size: .9em;
    border-left: none;
}

.sidebarblock {
    background-color: var(--sidebar-background-color);
    border-color: #ccc;
}

.sidebarblock > .content > .title {
    color: var(--link-color-default);
}

table.tableblock.grid-all {
    border-collapse: collapse;
    -webkit-border-radius: 0;
    border-radius: 0;
}

table.tableblock.grid-all th.tableblock, table.tableblock.grid-all td.tableblock {
    border-bottom: 1px solid #aaa;
}

#footer {
    background-color: var(--accent-primary-color);
    padding: 2em;
}

#footer-text {
    color: #eee;
    font-size: 0.8em;
    text-align: center;
}
</style>
<style>
pre.rouge table td { padding: 5px; }
pre.rouge table pre { margin: 0; }
pre.rouge, pre.rouge .w {
  color: #24292f;
  background-color: #f6f8fa;
}
pre.rouge .k, pre.rouge .kd, pre.rouge .kn, pre.rouge .kp, pre.rouge .kr, pre.rouge .kt, pre.rouge .kv {
  color: #cf222e;
}
pre.rouge .gr {
  color: #f6f8fa;
}
pre.rouge .gd {
  color: #82071e;
  background-color: #ffebe9;
}
pre.rouge .nb {
  color: #953800;
}
pre.rouge .nc {
  color: #953800;
}
pre.rouge .no {
  color: #953800;
}
pre.rouge .nn {
  color: #953800;
}
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</head>
<body class="article toc2 toc-left">
<div id="header">
<h1>MVVM Dialog Sample</h1>
<div id="toc" class="toc2">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#_before_we_start">Before we start</a></li>
<li><a href="#_solution_1_use_reactiveui_interactions">Solution 1 : Use ReactiveUI-Interactions</a>
<ul class="sectlevel2">
<li><a href="#_step_1_setup_the_viewmodel">Step 1: Setup the ViewModel</a></li>
<li><a href="#_step_2_prepare_the_view">Step 2: Prepare the View</a></li>
<li><a href="#_step_3_see_it_in_action">Step 3: See it in action</a></li>
</ul>
</li>
<li><a href="#_solution_2_write_your_own_interaction_class">Solution 2 : Write your own Interaction-class</a>
<ul class="sectlevel2">
<li><a href="#_step1_create_the_interaction_class">Step1: Create the Interaction-class</a></li>
<li><a href="#_step_2_prepare_the_viewmodel">Step 2: Prepare the ViewModel</a></li>
<li><a href="#_step_3_prepare_the_view">Step 3: Prepare the View</a></li>
<li><a href="#_step_4_see_it_in_action">Step 4: See it in action</a></li>
</ul>
</li>
<li><a href="#_related">Related</a></li>
</ul>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>This example will show you how to use <code>Interactions</code> to show <a href="https://docs.avaloniaui.net/docs/next/basics/user-interface/file-dialogs">[dialogs]</a> in your MVVM application</p>
</div>
<!-- toc disabled -->
<h3 id="_difficulty" class="discrete">Difficulty</h3>
<div class="paragraph">
<p>🐔 Normal 🐔</p>
</div>
<h3 id="_buzz_words" class="discrete">Buzz-Words</h3>
<div class="paragraph">
<p>MVVM, Dialog, FileDialogs, TopLevel, Clipboard</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_before_we_start">Before we start</h2>
<div class="sectionbody">
<div class="paragraph">
<p>We assume you already now how the MVVM pattern works and how dialogs, such as file dialogs, can be shown in general. You should also know what a <a href="https://docs.avaloniaui.net/docs/next/concepts/toplevel">[TopLevel]</a>-control in Avalonia is and what it can be used for.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_solution_1_use_reactiveui_interactions">Solution 1 : Use ReactiveUI-Interactions</h2>
<div class="sectionbody">
<div class="admonitionblock warning">
<table>
<tr>
<td class="icon">
<i class="fa icon-warning" title="Warning"></i>
</td>
<td class="content">
Solution 1 requires the use of Avalonia 11.2.0 or higher due to a breaking change in ReactiveUI.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>In this section you will learn how to use Reactive UI <a href="https://www.reactiveui.net/docs/handbook/interactions/">[<code>Interactions</code>]</a> in order to interact with your <code>View</code>.</p>
</div>
<div class="sect2">
<h3 id="_step_1_setup_the_viewmodel">Step 1: Setup the ViewModel</h3>
<div class="paragraph">
<p>In our ViewModel we add a property for the <code>Interaction</code> which we can use later to interact with the <code>View</code>, for example inside a <code>Command</code>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="c#"><span class="k">public</span> <span class="nf">InteractionViewModel</span><span class="p">()</span>
<span class="p">{</span>
    <span class="n">_selectFilesInteraction</span> <span class="p">=</span> <span class="k">new</span> <span class="n">Interaction</span><span class="p">&lt;</span><span class="kt">string</span><span class="p">?,</span> <span class="kt">string</span><span class="p">[]?&gt;();</span>
<span class="p">}</span>

<span class="k">private</span> <span class="k">readonly</span> <span class="n">Interaction</span><span class="p">&lt;</span><span class="kt">string</span><span class="p">?,</span> <span class="kt">string</span><span class="p">[]?&gt;</span> <span class="n">_selectFilesInteraction</span><span class="p">;</span>

<span class="c1">/// &lt;summary&gt;</span>
<span class="c1">/// Gets the select files interaction</span>
<span class="c1">/// &lt;/summary&gt;</span>
<span class="k">public</span> <span class="n">Interaction</span><span class="p">&lt;</span><span class="kt">string</span><span class="p">?,</span> <span class="kt">string</span><span class="p">[]?&gt;</span> <span class="n">SelectFilesInteraction</span> <span class="p">=&gt;</span> <span class="k">this</span><span class="p">.</span><span class="n">selectFilesInteraction</span><span class="p">;</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>The <code>Interaction</code> is a generic class, where the first parameter defines the input (in our case the file dialog title) and the second parameter defines the expected return type (in our case a list of files).</p>
</div>
</div>
<div class="sect2">
<h3 id="_step_2_prepare_the_view">Step 2: Prepare the View</h3>
<div class="paragraph">
<p>We add a <code>ReactiveUserControl</code> as your view. This control gives us the ability to register a handler for our interactions. Let&#8217;s add this handler in the UserControls code behind:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="csharp"><span class="k">private</span> <span class="k">async</span> <span class="n">Task</span> <span class="nf">InteractionHandler</span><span class="p">(</span><span class="n">IInteractionContext</span><span class="p">&lt;</span><span class="kt">string</span><span class="p">?,</span> <span class="kt">string</span><span class="p">[]?&gt;</span> <span class="n">context</span><span class="p">)</span>
<span class="p">{</span>
    <span class="c1">// Get our parent top level control in order to get the needed service (in our sample the storage provider. Can also be the clipboard etc.)</span>
    <span class="kt">var</span> <span class="n">topLevel</span> <span class="p">=</span> <span class="n">TopLevel</span><span class="p">.</span><span class="nf">GetTopLevel</span><span class="p">(</span><span class="k">this</span><span class="p">);</span>

    <span class="kt">var</span> <span class="n">storageFiles</span> <span class="p">=</span> <span class="k">await</span> <span class="n">topLevel</span><span class="p">!.</span><span class="n">StorageProvider</span>
        <span class="p">.</span><span class="nf">OpenFilePickerAsync</span><span class="p">(</span>
                    <span class="k">new</span> <span class="nf">FilePickerOpenOptions</span><span class="p">()</span>
                    <span class="p">{</span>
                        <span class="n">AllowMultiple</span> <span class="p">=</span> <span class="k">true</span><span class="p">,</span>
                        <span class="n">Title</span> <span class="p">=</span> <span class="n">context</span><span class="p">.</span><span class="n">Input</span>
                    <span class="p">});</span>

    <span class="n">context</span><span class="p">.</span><span class="nf">SetOutput</span><span class="p">(</span><span class="n">storageFiles</span><span class="p">.</span><span class="nf">Select</span><span class="p">(</span><span class="n">x</span> <span class="p">=&gt;</span> <span class="n">x</span><span class="p">.</span><span class="n">Name</span><span class="p">).</span><span class="nf">ToArray</span><span class="p">());</span>
<span class="p">}</span></code></pre>
</div>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
We are using an async Task to not block the UI. As parameter we need to pass an <code>IInteractionContext</code> which has one generic parameter for the input (in our case a string for the dialog title) and one for the output (in our case an array of selected files).
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>In the constructor of our <code>ReactiveUserControl</code> we need to setup the interaction inside <code>this.WhenActivated</code> like shown below:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="csharp"><span class="k">public</span> <span class="nf">InteractionView</span><span class="p">()</span>
<span class="p">{</span>
    <span class="nf">InitializeComponent</span><span class="p">();</span>

    <span class="k">this</span><span class="p">.</span><span class="nf">WhenActivated</span><span class="p">(</span><span class="n">d</span> <span class="p">=&gt;</span>
    <span class="p">{</span>
        <span class="nf">d</span><span class="p">(</span><span class="n">ViewModel</span><span class="p">!.</span><span class="n">SelectFilesInteraction</span><span class="p">.</span><span class="nf">RegisterHandler</span><span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="n">InteractionHandler</span><span class="p">));</span>
    <span class="p">});</span>
<span class="p">}</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Now we can setup the <code>XAML</code> as following. Mind the binding of the <code>Button</code> to our <code>Command</code> in the <code>ViewModel</code>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;UserControl</span> <span class="na">xmlns=</span><span class="s">"https://github.com/avaloniaui"</span>
             <span class="na">xmlns:x=</span><span class="s">"http://schemas.microsoft.com/winfx/2006/xaml"</span>
             <span class="na">xmlns:d=</span><span class="s">"http://schemas.microsoft.com/expression/blend/2008"</span>
             <span class="na">xmlns:mc=</span><span class="s">"http://schemas.openxmlformats.org/markup-compatibility/2006"</span>
             <span class="na">xmlns:vm=</span><span class="s">"using:MvvmDialogSample.ViewModels"</span>
			 <span class="na">mc:Ignorable=</span><span class="s">"d"</span> <span class="na">d:DesignWidth=</span><span class="s">"800"</span> <span class="na">d:DesignHeight=</span><span class="s">"450"</span>
             <span class="na">x:DataType=</span><span class="s">"vm:InteractionViewModel"</span>
			 <span class="na">x:Class=</span><span class="s">"MvvmDialogSample.Views.InteractionView"</span><span class="nt">&gt;</span>
	<span class="nt">&lt;Grid</span> <span class="na">RowDefinitions=</span><span class="s">"Auto,*,Auto"</span><span class="nt">&gt;</span>
		<span class="nt">&lt;TextBlock</span> <span class="na">Text=</span><span class="s">"Selected Files:"</span> <span class="nt">/&gt;</span>
		<span class="nt">&lt;ListBox</span> <span class="na">ItemsSource=</span><span class="s">"{Binding SelectedFiles}"</span> <span class="na">Grid.Row=</span><span class="s">"1"</span> <span class="nt">/&gt;</span>
		<span class="nt">&lt;Button</span> <span class="na">Content=</span><span class="s">"Select Files"</span>
				<span class="na">Command=</span><span class="s">"{Binding SelectFilesCommand}"</span>
				<span class="na">Grid.Row=</span><span class="s">"2"</span> <span class="nt">/&gt;</span>
	<span class="nt">&lt;/Grid&gt;</span>
<span class="nt">&lt;/UserControl&gt;</span></code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_step_3_see_it_in_action">Step 3: See it in action</h3>
<div class="paragraph">
<p>Running the App you should be able to select any files on your system.</p>
</div>
<div class="imageblock">
<div class="content">
<img src="_docs/result_2.png" alt="ReactiveUI interaction sample">
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_solution_2_write_your_own_interaction_class">Solution 2 : Write your own Interaction-class</h2>
<div class="sectionbody">
<div class="paragraph">
<p>If you don&#8217;t want to use Reactive-UI you can also write your own <code>Interaction</code>-class to provide a similar functionality. In this section you will see one possible solution.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
We are going to use the <a href="https://learn.microsoft.com/en-us/dotnet/communitytoolkit/mvvm/">[CommunityToolkit.Mvvm]</a> in this sample, especially their source generators. If you are not familiar with it yet, read the online docs they provide first.
</td>
</tr>
</table>
</div>
<div class="sect2">
<h3 id="_step1_create_the_interaction_class">Step1: Create the Interaction-class</h3>
<div class="paragraph">
<p>In our project (or in a class library we use) we add a folder called <code>Core</code>. Inside this folder we add a new generic class called <code>Interaction</code>, which has basically the below mentioned API.</p>
</div>
<div class="paragraph">
<p>The class will have two generic parameters:</p>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1">TInput</dt>
<dd>
<p>The type of the input we expect</p>
</dd>
<dt class="hdlist1">TOutput</dt>
<dd>
<p>The type of the output we expect</p>
</dd>
</dl>
</div>
<div class="paragraph">
<p>It will implement two interfaces:</p>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1">ICommand</dt>
<dd>
<p>This interface helps us to use the interaction like any other command</p>
</dd>
<dt class="hdlist1">IDisposable</dt>
<dd>
<p>This interface helps us to unregister from event listeners</p>
</dd>
</dl>
</div>
<div class="paragraph">
<p>In addition we will add two methods:</p>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1">IDisposable RegisterHandler(Func&lt;TInput, Task&lt;TOutput&gt;&gt; handler)</dt>
<dd>
<p>This method will be used by the View to register the action to be performed.</p>
</dd>
<dt class="hdlist1">Task&lt;TOutput&gt; HandleAsync(TInput input)</dt>
<dd>
<p>This method will be called from the <code>ViewModel</code> with a given input and the <code>View</code> will return the requested output.</p>
</dd>
</dl>
</div>
<div class="paragraph">
<p>And this is how the final class looks like:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="c#"><span class="c1">/// &lt;summary&gt;</span>
<span class="c1">/// Simple implementation of Interaction pattern from ReactiveUI framework.</span>
<span class="c1">/// https://www.reactiveui.net/docs/handbook/interactions/</span>
<span class="c1">/// &lt;/summary&gt;</span>
<span class="k">public</span> <span class="k">sealed</span> <span class="k">class</span> <span class="nc">Interaction</span><span class="p">&lt;</span><span class="n">TInput</span><span class="p">,</span> <span class="n">TOutput</span><span class="p">&gt;</span> <span class="p">:</span> <span class="n">IDisposable</span><span class="p">,</span> <span class="n">ICommand</span>
<span class="p">{</span>
    <span class="c1">// this is a reference to the registered interaction handler.</span>
    <span class="k">private</span> <span class="n">Func</span><span class="p">&lt;</span><span class="n">TInput</span><span class="p">,</span> <span class="n">Task</span><span class="p">&lt;</span><span class="n">TOutput</span><span class="p">&gt;&gt;?</span> <span class="n">_handler</span><span class="p">;</span>

    <span class="c1">/// &lt;summary&gt;</span>
    <span class="c1">/// Performs the requested interaction &lt;see langword="async"/&gt;. Returns the result provided by the View</span>
    <span class="c1">/// &lt;/summary&gt;</span>
    <span class="c1">/// &lt;param name="input"&gt;The input parameter&lt;/param&gt;</span>
    <span class="c1">/// &lt;returns&gt;The result of the interaction&lt;/returns&gt;</span>
    <span class="c1">/// &lt;exception cref="InvalidOperationException"&gt;&lt;/exception&gt;</span>
    <span class="k">public</span> <span class="n">Task</span><span class="p">&lt;</span><span class="n">TOutput</span><span class="p">&gt;</span> <span class="nf">HandleAsync</span><span class="p">(</span><span class="n">TInput</span> <span class="n">input</span><span class="p">)</span>
    <span class="p">{</span>
        <span class="k">if</span> <span class="p">(</span><span class="n">_handler</span> <span class="k">is</span> <span class="k">null</span><span class="p">)</span>
        <span class="p">{</span>
            <span class="k">throw</span> <span class="k">new</span> <span class="nf">InvalidOperationException</span><span class="p">(</span><span class="s">"Handler wasn't registered"</span><span class="p">);</span>
        <span class="p">}</span>

        <span class="k">return</span> <span class="nf">_handler</span><span class="p">(</span><span class="n">input</span><span class="p">);</span>
    <span class="p">}</span>

    <span class="c1">/// &lt;summary&gt;</span>
    <span class="c1">/// Registers a handler to our Interaction</span>
    <span class="c1">/// &lt;/summary&gt;</span>
    <span class="c1">/// &lt;param name="handler"&gt;the handler to register&lt;/param&gt;</span>
    <span class="c1">/// &lt;returns&gt;a disposable object to clean up memory if not in use anymore/&gt;&lt;/returns&gt;</span>
    <span class="c1">/// &lt;exception cref="InvalidOperationException"&gt;&lt;/exception&gt;</span>
    <span class="k">public</span> <span class="n">IDisposable</span> <span class="nf">RegisterHandler</span><span class="p">(</span><span class="n">Func</span><span class="p">&lt;</span><span class="n">TInput</span><span class="p">,</span> <span class="n">Task</span><span class="p">&lt;</span><span class="n">TOutput</span><span class="p">&gt;&gt;</span> <span class="n">handler</span><span class="p">)</span>
    <span class="p">{</span>
        <span class="k">if</span> <span class="p">(</span><span class="n">_handler</span> <span class="k">is</span> <span class="n">not</span> <span class="k">null</span><span class="p">)</span>
        <span class="p">{</span>
            <span class="k">throw</span> <span class="k">new</span> <span class="nf">InvalidOperationException</span><span class="p">(</span><span class="s">"Handler was already registered"</span><span class="p">);</span>
        <span class="p">}</span>

        <span class="n">_handler</span> <span class="p">=</span> <span class="n">handler</span><span class="p">;</span>
        <span class="n">CanExecuteChanged</span><span class="p">?.</span><span class="nf">Invoke</span><span class="p">(</span><span class="k">this</span><span class="p">,</span> <span class="n">EventArgs</span><span class="p">.</span><span class="n">Empty</span><span class="p">);</span>
        <span class="k">return</span> <span class="k">this</span><span class="p">;</span>
    <span class="p">}</span>

    <span class="k">public</span> <span class="k">void</span> <span class="nf">Dispose</span><span class="p">()</span>
    <span class="p">{</span>
        <span class="n">_handler</span> <span class="p">=</span> <span class="k">null</span><span class="p">;</span>
    <span class="p">}</span>

    <span class="k">public</span> <span class="kt">bool</span> <span class="nf">CanExecute</span><span class="p">(</span><span class="kt">object</span><span class="p">?</span> <span class="n">parameter</span><span class="p">)</span> <span class="p">=&gt;</span> <span class="n">_handler</span> <span class="k">is</span> <span class="n">not</span> <span class="k">null</span><span class="p">;</span>

    <span class="k">public</span> <span class="k">void</span> <span class="nf">Execute</span><span class="p">(</span><span class="kt">object</span><span class="p">?</span> <span class="n">parameter</span><span class="p">)</span> <span class="p">=&gt;</span> <span class="nf">HandleAsync</span><span class="p">((</span><span class="n">TInput</span><span class="p">?)</span><span class="n">parameter</span><span class="p">!);</span>

    <span class="k">public</span> <span class="k">event</span> <span class="n">EventHandler</span><span class="p">?</span> <span class="n">CanExecuteChanged</span><span class="p">;</span>
<span class="p">}</span></code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_step_2_prepare_the_viewmodel">Step 2: Prepare the ViewModel</h3>
<div class="paragraph">
<p>In our <code>CustomInteractionViewModel</code> we need to add a new instance of the <code>Interaction</code>. In our sample we want to provide a dialog title (<code>string</code>) as the input and we expect a list of selected files (<code>string[]?</code>)</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="c#"><span class="c1">/// &lt;summary&gt;</span>
<span class="c1">/// Gets an instance of our own Interaction class</span>
<span class="c1">/// &lt;/summary&gt;</span>
<span class="k">public</span> <span class="n">Interaction</span><span class="p">&lt;</span><span class="kt">string</span><span class="p">,</span> <span class="kt">string</span><span class="p">[]?&gt;</span> <span class="n">SelectFilesInteraction</span> <span class="p">{</span> <span class="k">get</span><span class="p">;</span> <span class="p">}</span> <span class="p">=</span> <span class="k">new</span> <span class="n">Interaction</span><span class="p">&lt;</span><span class="kt">string</span><span class="p">,</span> <span class="kt">string</span><span class="p">[]?&gt;();</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>In a next step we add a Command which will call the interaction:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="c#"><span class="p">[</span><span class="n">RelayCommand</span><span class="p">]</span>
<span class="k">private</span> <span class="k">async</span> <span class="n">Task</span> <span class="nf">SelectFilesAsync</span><span class="p">()</span>
<span class="p">{</span>
    <span class="n">SelectedFiles</span> <span class="p">=</span> <span class="k">await</span> <span class="n">SelectFilesInteraction</span><span class="p">.</span><span class="nf">HandleAsync</span><span class="p">(</span><span class="s">"Hello from Avalonia"</span><span class="p">);</span>
<span class="p">}</span></code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_step_3_prepare_the_view">Step 3: Prepare the View</h3>
<div class="paragraph">
<p>Somehow we need to register the <code>View</code> to the <code>Interaction</code> of the <code>ViewModel</code>. In Avalonia we have an event called <code>OnDataContextChanged</code> which we can listen to, or, if we are in code behind, simply override it.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="c#"><span class="c1">// Stores a reference to the disposable in order to clean it up if needed</span>
<span class="n">IDisposable</span><span class="p">?</span> <span class="n">_selectFilesInteractionDisposable</span><span class="p">;</span>

<span class="k">protected</span> <span class="k">override</span> <span class="k">void</span> <span class="nf">OnDataContextChanged</span><span class="p">(</span><span class="n">EventArgs</span> <span class="n">e</span><span class="p">)</span>
<span class="p">{</span>
    <span class="c1">// Dispose any old handler</span>
    <span class="n">_selectFilesInteractionDisposable</span><span class="p">?.</span><span class="nf">Dispose</span><span class="p">();</span>

    <span class="k">if</span> <span class="p">(</span><span class="n">DataContext</span> <span class="k">is</span> <span class="n">CustomInteractionViewModel</span> <span class="n">vm</span><span class="p">)</span>
    <span class="p">{</span>
        <span class="c1">// register the interaction handler</span>
        <span class="n">_selectFilesInteractionDisposable</span> <span class="p">=</span>
            <span class="n">vm</span><span class="p">.</span><span class="n">SelectFilesInteraction</span><span class="p">.</span><span class="nf">RegisterHandler</span><span class="p">(</span><span class="n">InteractionHandler</span><span class="p">);</span>
    <span class="p">}</span>

    <span class="k">base</span><span class="p">.</span><span class="nf">OnDataContextChanged</span><span class="p">(</span><span class="n">e</span><span class="p">);</span>
<span class="p">}</span></code></pre>
</div>
</div>
<div class="admonitionblock warning">
<table>
<tr>
<td class="icon">
<i class="fa icon-warning" title="Warning"></i>
</td>
<td class="content">
Remember that the DataContext can change several times. In order to not get any memory leak, we have to dispose any earlier registration to an older view model
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>The interaction handler itself is quite simple</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="c#"><span class="k">private</span> <span class="k">async</span> <span class="n">Task</span><span class="p">&lt;</span><span class="kt">string</span><span class="p">[]?&gt;</span> <span class="nf">InteractionHandler</span><span class="p">(</span><span class="kt">string</span> <span class="n">input</span><span class="p">)</span>
<span class="p">{</span>
    <span class="c1">// Get a reference to our TopLevel (in our case the parent Window)</span>
    <span class="kt">var</span> <span class="n">topLevel</span> <span class="p">=</span> <span class="n">TopLevel</span><span class="p">.</span><span class="nf">GetTopLevel</span><span class="p">(</span><span class="k">this</span><span class="p">);</span>

    <span class="c1">// Try to get the files</span>
    <span class="kt">var</span> <span class="n">storageFiles</span> <span class="p">=</span> <span class="k">await</span> <span class="n">topLevel</span><span class="p">!.</span><span class="n">StorageProvider</span><span class="p">.</span><span class="nf">OpenFilePickerAsync</span><span class="p">(</span>
                    <span class="k">new</span> <span class="nf">FilePickerOpenOptions</span><span class="p">()</span>
                    <span class="p">{</span>
                        <span class="n">AllowMultiple</span> <span class="p">=</span> <span class="k">true</span><span class="p">,</span>
                        <span class="n">Title</span> <span class="p">=</span> <span class="n">input</span>
                    <span class="p">});</span>

    <span class="c1">// Transform the files as needed and return them. If no file was selected, null will be returned</span>
    <span class="k">return</span> <span class="n">storageFiles</span><span class="p">?.</span><span class="nf">Select</span><span class="p">(</span><span class="n">x</span> <span class="p">=&gt;</span> <span class="n">x</span><span class="p">.</span><span class="n">Name</span><span class="p">)?.</span><span class="nf">ToArray</span><span class="p">();</span>
<span class="p">}</span></code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_step_4_see_it_in_action">Step 4: See it in action</h3>
<div class="paragraph">
<p>Run the App and try to select as many files as you like.</p>
</div>
<div class="imageblock">
<div class="content">
<img src="_docs/result_1.png" alt="Custom interaction sample">
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_related">Related</h2>
<div class="sectionbody">
<div class="paragraph">
<p>There are more ways to show dialogs from the ViewModel, for example:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="../DialogManagerSample">DialogManager Service</a></p>
</li>
<li>
<p><a href="https://github.com/AvaloniaCommunity/awesome-avalonia#mvvm&#8212;&#8203;mvp&#8212;&#8203;mvu">third party libs</a></p>
</li>
</ul>
</div>
</div>
</div>
</div>
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<div id="footer-text">
Last updated 2025-11-06 19:42:36 UTC
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